Pinhole closure measurements

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Spatial-filter pinholes and knife-edge samples were irradiated in vacuum by 1053-nm, 5-20 ns pulses at intensities to 500 GW/cm<sup2</sup>. The knife-edge samples were fabricated of plastic, carbon, ahnuinum, stainless steel, molybdenum, tantalum, gold and an absorbing glass. Time-resolved two-beam interferometry with a 40-ns probe pulse was used to observe phase shifts in the expanding laser-induced plasma. For all of these materials, at any time during square-pulse irradiation, the phase shift fell exponentially with distance from the edge of the sample. The expansion was characterized by the propagation velocity V<sub>2x</sub> of the contour for a 2(pi) phase shift. To within experimental ... continued below

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645 Kilobytes

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Afeyan, B. B.; Boley, C. D.; Estabrook, K. G.; Kirkwood, R. K.; Milam, D.; Murray, J. E. et al. July 20, 1998.

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Spatial-filter pinholes and knife-edge samples were irradiated in vacuum by 1053-nm, 5-20 ns pulses at intensities to 500 GW/cm<sup2</sup>. The knife-edge samples were fabricated of plastic, carbon, ahnuinum, stainless steel, molybdenum, tantalum, gold and an absorbing glass. Time-resolved two-beam interferometry with a 40-ns probe pulse was used to observe phase shifts in the expanding laser-induced plasma. For all of these materials, at any time during square-pulse irradiation, the phase shift fell exponentially with distance from the edge of the sample. The expansion was characterized by the propagation velocity V<sub>2x</sub> of the contour for a 2(pi) phase shift. To within experimental error, V<sub>2x</sub>, was constant during irradiation at a particular intensity, and it increased linearly with intensity for intensities <300 GW/cn<sup>2</sup>. For metal samples, V, exhibited an approximate M<sup>-0.5</sup> dependence where M is the atomic mass. Plasmas of plastic, carbon and absorbing glass produced larger phase shifts, and expanded more rapidly, than plasmas of the heavy metals. The probe beam and interferometer were also used to observe the closing of pinholes. With planar pinholes, accumulation of on-axis plasma was observed along with the advance of plasma away from the edge of the hole. On-axis closure was not observed in square, 4-leaf pinholes.

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645 Kilobytes

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  • Third Annual International Conference on Solid State Lasers Application (SSLA) for Inertial Confinement Fusion (ICF), Monterey, CA, June 7-12, 1998

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  • Other: DE00003396
  • Report No.: UCRL-JC-129854
  • Grant Number: W-7405-Eng-48
  • Office of Scientific & Technical Information Report Number: 3396
  • Archival Resource Key: ark:/67531/metadc685027

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  • July 20, 1998

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  • July 25, 2015, 2:20 a.m.

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  • May 6, 2016, 11:22 p.m.

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Afeyan, B. B.; Boley, C. D.; Estabrook, K. G.; Kirkwood, R. K.; Milam, D.; Murray, J. E. et al. Pinhole closure measurements, article, July 20, 1998; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc685027/: accessed September 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.